AntFile[SequentialParallel.ant]
  AntProject[project]
    AntTarget:[main]
      AntElement[PsiElement(XML_ATTRIBUTE_VALUE)]('main')
      AntAllTasksContainer[sequential]
        AntTask[echo]('<echo>1</echo>')
        AntTask[echo]('<echo>2</echo>')
      AntAllTasksContainer[parallel]
        AntTask[echo]('<echo>1</echo>')
        AntTask[echo]('<echo>2</echo>')